Intelligent Fire Prevention and Extinguishing Device for Liquid Nitrogen and Transport Vehicle for Flammable and Combustible Dangerous Goods

Abstract

The present invention provides a liquid nitrogen intelligent fire prevention and extinguishing device and a transport vehicle for inflammable and explosive dangerous goods, belonging to the technical field of protection for transport vehicles of inflammable and explosive dangerous goods. The liquid nitrogen intelligent fire prevention and extinguishing device includes a detection mechanism, a liquid nitrogen mechanism and an anti-collision buffer mechanism. By detecting the external temperature of the tank body and the pressure acting on the tank body through the detection mechanism, it is determined whether to execute the liquid nitrogen mechanism. The liquid nitrogen mechanism can wrap and isolate the periphery of the tank body with a high-pressure liquid nitrogen gas flow, so that the temperature drops rapidly, blocks the ignition point and cuts off the combustion conditions. Through the combined functions of the liquid nitrogen mechanism and the anti-collision buffer mechanism, the tank body is maximally protected from damage and leakage under the action of external impact and overturning. The transport vehicle includes a vehicle body and the above-mentioned liquid nitrogen intelligent fire prevention and extinguishing device. The liquid nitrogen intelligent fire prevention and extinguishing device for transport vehicles of inflammable and explosive dangerous goods provided by the present invention can also be applied to static storage tank containers of inflammable and explosive dangerous goods to prevent the continuous expansion of the harm of malignant accidents and reduce potential safety hazards.

Description

Technical Field

[0001] The present invention belongs to the technical field of protection for vehicles carrying inflammable and explosive dangerous goods. More specifically, it relates to a liquid nitrogen intelligent fire prevention and extinguishing device and a transport vehicle for transporting inflammable and explosive dangerous goods. Background Art

[0002] In recent years, with the rapid development of the modern petroleum and chemical industries, the country's demand for energy has been increasing. As an important transportation method for various chemical dangerous goods and inflammable and explosive goods, road transportation has been widely used. However, traffic accidents related to inflammable and explosive dangerous goods occur repeatedly every year. Once an accident occurs to a vehicle transporting chemical dangerous goods or inflammable and explosive goods, malignant accidents such as chemical pollution or oil leakage fires and explosions will cause huge losses to people's lives and property. With the rapid increase in the scale of the special industry, the intelligent safety management of dangerous goods transport vehicles and the research and development of upgrading the hardware equipment of the carriers have become extremely urgent.

[0003] Currently, the tanks actually used in production for transporting corrosive, flammable, and explosive media basically comply with the standard of "Technical Conditions for Metal Atmospheric Tanks of Motor Vehicle Transport Liquid Dangerous Goods Tank Vehicles". Most of the tanks are storage and transportation tanks with a single layer plus a thermal insulation layer. (With supporting breathing valves and emergency discharge devices, a discharge system and one to two breathing valves. The air outlet of the breathing valve opens when the pressure in the tank is 6 KPa - 8 KPa higher than the external pressure, and the intake valve opens when the pressure in the tank is 2 KPa - 3 KPa lower than the external pressure, as well as active safety protection measures such as static conduction devices). It mainly meets the transportation conditions for the carrier tank body itself, and there is no particularly safe guarantee for the passive protection against accidental leakage fires during storage and transportation, accidental collisions, rollovers, etc. during road transportation, and the protection ability for the tank body is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a liquid nitrogen intelligent fire prevention and extinguishing device and a transport vehicle for transporting inflammable and explosive dangerous goods, aiming to solve the technical problem of low passive protection ability when the transport vehicle for inflammable and explosive dangerous goods in the prior art encounters collisions, leaks, and accident fires.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a liquid nitrogen intelligent fire prevention and extinguishing device for a vehicle transporting inflammable and explosive dangerous goods, comprising a detection mechanism, a liquid nitrogen mechanism and an anti-collision buffer mechanism, wherein the detection mechanism is arranged at the front and rear ends of a tank body for containing inflammable and explosive dangerous goods, and is used to detect the impact pressure exerted on the tank body by the outside world and to detect the temperature of the tank body, and the detection mechanism can preset the limited range of the impact pressure on the tank body and the preset tank body temperature; the liquid nitrogen mechanism is arranged at the upper end of the tank body and is connected to the detection mechanism, and the liquid nitrogen mechanism is connected in parallel with a compressed air system provided on the transport vehicle for transporting the tank body, and the liquid nitrogen machine The liquid nitrogen in the mechanism is pushed onto the tank body with the help of the air pressure of the compressed air system, and enters the semi-enclosed space between the single layer of the tank body and the outer armor, and then the liquid nitrogen forms an ice gas layer to surround the single layer of the tank body and realize self-rescue, change the temperature of the tank body in a short time, and block the explosion conditions formed by the high-temperature expansion of combustion. The operation of the liquid nitrogen mechanism is controlled by the detection mechanism. When the tank body temperature and impact pressure detected by the detection mechanism are within a limited range, the detection mechanism commands the liquid nitrogen mechanism to operate; the anti-collision buffer mechanism is arranged on the transport vehicle or the tank body, and is used to protect the tank body from being collided during transportation and to buffer the distortion force and inertia force acting on the tank body.

[0006] As another embodiment of the present application, the detection mechanism includes a pressure sensor, a temperature sensor and an instrument control box; the pressure sensor is arranged at the front and rear ends of the tank body, and is used to detect the impact pressure acting on the tank body; there are multiple temperature sensors and they are all arranged at the upper end of the tank body, and are used to detect the temperature of the tank body; the instrument control box has a built-in DC lithium power supply, a PLC data acquisition and execution control system, which are electrically connected to the pressure sensor and the temperature sensor respectively, and are used to receive the signals of the pressure sensor and the temperature sensor. The limited range of the stamping pressure applied to the tank body and the preset tank body temperature can be set on the execution control system, and the execution control system can control the operation of the liquid nitrogen mechanism.

[0007] As another embodiment of the present application, the liquid nitrogen mechanism includes a frame body, a liquid nitrogen storage tank, a liquid nitrogen control valve, a compressed air solenoid valve, and a mixed gas delivery assembly; the frame body is arranged on the transport vehicle and around the tank body for fixedly wrapping the tank body; the liquid nitrogen storage tank stores liquid nitrogen and is arranged on the top of the frame body; the liquid nitrogen control valve is arranged on the liquid nitrogen output conduit of the liquid nitrogen storage tank, is connected to the instrument automatic control box and controlled by the instrument automatic control box, and the liquid nitrogen output conduit is also connected in parallel to the compressed air system. The original vehicle-mounted self-provided compressed air is used as the pushing and guiding auxiliary for liquid nitrogen transportation, and can push the liquid nitrogen to various parts of the tank body. After the liquid nitrogen control valve is opened, the liquid nitrogen in the liquid nitrogen storage tank is output to the liquid nitrogen output conduit, and the liquid nitrogen itself pressure and the output air pressure of the compressed air system are balanced to be transported to each area on the tank body; the compressed air solenoid valve is arranged between the compressed air system and the liquid nitrogen output conduit for opening control and assisting in accompanying the compressed air system to transport to the liquid nitrogen output conduit; one end of the mixed gas delivery assembly is communicated with the outlet of the liquid nitrogen output conduit, and the other end is a free end and is located between the single layer of the tank body and the thermal insulation layer for transporting the liquid nitrogen gas flow into the semi-closed space.

[0008] As another embodiment of the present application, the mixed gas delivery assembly includes a main pipeline and a plurality of nozzles. One end of the main pipeline is communicated with the liquid nitrogen outlet of the liquid nitrogen output conduit, and the other end is closed for transporting liquid nitrogen. The length direction of the main pipeline is parallel to the length direction of the tank body; there are a plurality of nozzles, which are evenly distributed on the lower end surface of the main pipeline and evenly distributed along the length direction of the tank body. A plurality of the nozzles are all communicated with the main pipeline, and the liquid nitrogen in the main pipeline is sprayed into the closed space through the plurality of nozzles.

[0009] As another embodiment of the present application, the anti-collision buffer mechanism includes a front inertial pressure buffer mechanism and a rear inertial pressure buffer mechanism. The front inertial pressure buffer mechanism is arranged in the middle of the front end face of the tank body for buffering the pressure acting on the front end of the tank body; the rear inertial pressure buffer mechanism is arranged in the middle of the rear end face of the tank body for buffering the pressure acting on the rear end of the tank body.

[0010] As another embodiment of the present application, the tank body can slide in a small range along the length direction of the transport vehicle by an external force. The anti-collision buffer mechanism further includes a front steel spring in the basic track and a rear steel spring in the basic track; one end of the front steel spring in the basic track is arranged at the bottom of the front end of the tank body, and the other end is connected to the front end of the transport vehicle frame for buffering the pressure of the front and rear inertial external forces acting on the front end of the tank body; one end of the rear steel spring in the basic track is arranged at the bottom of the rear end of the tank body, and the other end is connected to the rear end of the transport vehicle frame for buffering the pressure of the front and rear inertial external forces acting on the tank body.

[0011] As another embodiment of the present application, a track is provided on the transport vehicle frame. The track is arranged along the front-back length direction of the tank body. A slider for slidably connecting with the track is provided at the bottom end of the tank body. The track is fixed to the frame by a locking member, and the slider is fixed to the bottom end of the tank body by a locking member. An anti-disengagement component is provided on the track, and the anti-disengagement component is used to prevent the tank body from slipping off the track.

[0012] As another embodiment of the present application, the anti-collision buffer mechanism further includes a frame-type support column buffer component. There are multiple support column buffer components, which are independent arc-shaped buffer frames and are all arranged along the circumferential direction of the tank body in the closed space. The bottom end is connected to the single-layer outer wall of the tank body through a steel spring wrapped with buffer rubber, and the top end is connected to the inner wall of the thermal insulation layer, providing support for the pipeline of the liquid nitrogen mechanism, maintaining the buffer distance for the thermal insulation layer to bear external forces, and being used for buffering the pressure acting on the thermal insulation layer in different directions.

[0013] As another embodiment of the present application, an anti-collision steel cross beam is fixedly provided on the transport vehicle and is fixed to the skirt of the vehicle body structure. The tank body is placed inside the protection frame surrounded by the anti-collision steel cross beam. A plurality of protection buffer components are provided between the anti-collision steel cross beam and the tank body to support and suspend the connection. The protection buffer components are used to buffer the pressure acting on the tank body;

[0014] The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transport vehicles of the present invention is also applicable to on-vehicle carbon dioxide fire extinguishing, on-vehicle dry powder fire extinguishing, and liquid nitrogen medium transportation control.

[0015] The present invention also provides a transport vehicle, which includes a vehicle body for transporting inflammable and explosive dangerous goods, and also includes an intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transport vehicles provided on the vehicle body.

[0016] The beneficial effects of the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transport vehicles provided by the present invention are as follows: Compared with the prior art, the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transport vehicles of the present invention can timely provide passive protection for the tank body, enabling the tank body to be minimally damaged. By detecting the external temperature of the tank body and the pressure acting on the tank body through the detection mechanism, and through the preset limit range, it can be determined whether to activate the liquid nitrogen mechanism. If an accident occurs and the driver and passengers are trapped or cannot directly operate manually, then the external temperature of the tank body rises and / or the pressure on the tank body increases, and the liquid nitrogen is automatically and immediately released, rapidly cooling the closed space to minus 65 - 125 degrees, ensuring that the temperature around the tank body drops suddenly, cutting off the combustion conditions, and preventing a violent explosion caused by the fusion expansion due to the increase in combustion temperature, waiting for professional rescue; The anti-collision buffer mechanism can reduce and relieve the malignant collision accidents from different directions of the carrier, minimizing the inertia and direct contact damage of the outer shell of the tank body itself, and even preventing ordinary overturning, reducing the accident leakage rate of the tank body for transporting oil or chemical dangerous goods.

[0017] The beneficial effects of the transport vehicle provided by the present invention are as follows: The present invention is also applicable to software and hardware devices, automatic systems, and pipeline transportation methods for inflammable, explosive, and dangerous goods, and can also be equipped with carbon dioxide medium, dry powder, and other fire extinguishing media. Compared with the prior art, the transport vehicle provided by the present invention adopts a liquid nitrogen intelligent fire prevention and extinguishing device, and the beneficial effects are the same as those of the above-mentioned liquid nitrogen intelligent fire prevention and extinguishing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Structural schematic diagram of the liquid nitrogen intelligent fire prevention and extinguishing device for the inflammable, explosive, and dangerous goods transport vehicle provided by the embodiment of the present invention;

[0020] Figure 2 Longitudinal sectional schematic diagram of the liquid nitrogen intelligent fire prevention and extinguishing device for the inflammable, explosive, and dangerous goods transport vehicle provided by the embodiment of the present invention;

[0021] Figure 3 Structural schematic diagram of the connection between the bottom of the tank body of the liquid nitrogen intelligent fire prevention and extinguishing device for the inflammable, explosive, and dangerous goods transport vehicle and the transport vehicle frame provided by the embodiment of the present invention;

[0022] Figure 4 Schematic diagram combining the front view and side view of the connection structure between a partial frame body and a detachable armor of the liquid nitrogen intelligent fire prevention and extinguishing device for the inflammable, explosive, and dangerous goods transport vehicle provided by another embodiment of the present invention.

[0023] In the figure: 1. Detection mechanism; 11. Pressure sensor; 12. Temperature sensor; 13. Instrument automatic control box;

[0024] 2. Liquid nitrogen mechanism; 21. Frame body; 22. Liquid nitrogen storage tank; 23. Liquid nitrogen control valve; 24. Compressed air solenoid valve; 25. Mixed gas delivery component; 251. Main pipeline; 252. Nozzle; 26. Liquid nitrogen output conduit; Armor 27;

[0025] 3. Anti-collision buffer mechanism; 31. Front inertial pressure buffer mechanism; 32. Rear inertial pressure buffer mechanism; 33. Front steel spring in the basic track; 34. Rear steel spring in the basic track; 35. Frame support column buffer component;

[0026] 4. Tank body;

[0027] 5. Track;

[0028] 6. Slide block

[0029] 7. Locking part

[0030] 8. Anti-collision steel cross beam

[0031] 9. Enclosed space

[0032] 10. Protective buffer component Specific implementation manner

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The present invention is developed on the premise of not violating the safety specifications of (National Specification Standards for Tank Vehicles for Transporting Liquid Hazardous Goods).

[0035] After liquid nitrogen is dispersed, the temperature formed in the air is minus 65 - 125 degrees, and its function is to quickly cool down, isolate air, and extinguish flammable substances.

[0036] The heat insulation layer on the tank body refers to: detachable protective quartz heat insulation tiles arranged on the tank body. A semi-enclosed space with small mesh eyes is formed between the heat insulation layer and the single layer of the tank body, so that liquid nitrogen can enter each area of the tank body, and it also prevents the formation of an expansion space in the interlayer under mild combustion conditions, prevents the formation of an expansion steam flow, and the outer cover falls off. Therefore, the heat insulation layer is designed as an armor heat insulation tile with air holes. Through multiple tiny air holes, the expansion gas in the semi-enclosed space can be released, and at the same time, the liquid nitrogen in the large air flow can be maintained in the space. After the space is filled with liquid nitrogen medium and cooled down, the liquid nitrogen and the water vapor in the air form an ice layer, and the tiny mesh eyes are sealed by the ice layer, thereby fundamentally blocking the oxygen combustion conditions and controlling the fire situation.

[0037] Please refer to together Figures 1 to 4, the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles provided by the present invention will be described. The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles includes a detection mechanism 1, a liquid nitrogen mechanism 2, and an anti-collision buffer mechanism 3. The detection mechanism 1 is arranged at the front and rear ends of the tank body 4 for containing inflammable and explosive dangerous goods, and is used to detect the impact pressure acting on the tank body 4 from the outside and the temperature of the tank body 4. The limiting ranges of the impact pressure and the temperature of the tank body 4 can be preset on the detection mechanism 1; the liquid nitrogen mechanism 2 is arranged at the upper end of the tank body 4 and is connected to the detection mechanism 1. The liquid nitrogen mechanism 2 is connected in parallel with the self-provided compressed air system on the transport vehicle for transporting the tank body 4. The liquid nitrogen in the liquid nitrogen mechanism 2 is pushed towards the tank body 4 by means of the air pressure of the compressed air system and enters the semi-closed space 9 (interlayer liquid nitrogen discharge space) between the single layer of the tank body 4 and the outer armor. Then, the liquid nitrogen forms an ice gas layer to surround the single layer of the tank body 4 and achieve self-rescue, changing the temperature of the tank body in a short time and blocking the explosion conditions formed by the high-temperature expansion of combustion. The operation of the liquid nitrogen mechanism 2 is controlled by the detection mechanism 1. When the temperature and impact pressure of the tank body 4 detected by the detection mechanism 1 are within the limiting range, the detection mechanism 1 commands the liquid nitrogen mechanism 2 to operate; the anti-collision buffer mechanism 3 is arranged on the transport vehicle or the tank body 4 and is used to protect the tank body 4 from being collided during transportation and buffer the torsional force and inertial force acting on the tank body 4.

[0038] Compared with the prior art, the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles provided by the present invention can timely provide passive buffer protection for the tank body 4 during an accident, so that the outer shell of the tank body 4 is not damaged and leaked to the greatest extent. By detecting the external temperature of the tank body 4 and the pressure acting on the tank body 4 through the detection mechanism 1, and through the preset limiting range, it can be determined whether to activate the liquid nitrogen mechanism 2. If an accident occurs and the driver and passengers are trapped or cannot directly operate manually, the temperature of the outer surface of the tank body 4 rises and / or the pressure on the tank body 4 increases, then the liquid nitrogen control valve 23 is automatically opened to release the stored liquid nitrogen, so that the surrounding closed space 9 (interlayer liquid nitrogen discharge space) of the tank body 4 is quickly cooled to -65 to -125 degrees Celsius, ensuring that the temperature around the tank body 4 drops suddenly, blocking the entry of sufficient oxygen and the combustion conditions, and preventing a violent explosion caused by the thermal fusion expansion due to the increase in combustion temperature, winning time to wait for professional rescue; the anti-collision buffer mechanism 3 can reduce and relieve the malignant collision accidents of the carrier from different directions, and minimize the inertia and direct damage of the outer shell of the tank body 4 itself, even in the case of non-violent ordinary tipping, reducing the accident leakage rate of the oil or chemical dangerous goods transportation vehicle of the tank body 4.

[0039] The above-mentioned outer armor can be understood as a heat preservation layer. The liquid nitrogen mechanism 2 and the two-way inlets of the self-provided compressed air outlet on the transport vehicle for transporting the tank body 4 are combined and enter the main pipe to push the liquid nitrogen medium to run at high speed in the pipe. The closed space 9 is a kind of interlayer liquid nitrogen discharge space.

[0040] For the setting of the limited range, the following situations can be referred to: For the temperature setting, a temperature range slightly higher than the temperature during daily transportation or the ambient temperature in summer can be set; for the pressure setting, the multiple of the impact force on the tank body 4 exceeding the load weight of the tank body 4 can be set. This pressure refers to the extreme impact pressure, that is, the pressure threshold when the tank body 4 collides and twists. If this threshold is exceeded, it can be considered as the limit pressure, and then the liquid nitrogen mechanism 2 is activated and plays a role. By setting the liquid nitrogen mechanism 2, the conditions for the explosion of the tank body 4 can be blocked. If the explosion conditions are blocked, the tank body 4 will not cause an explosion, preventing major accidents from occurring.

[0041] The air pressure output by the compressed air system on the transport vehicle pushes the liquid nitrogen into the closed space 9 (the interlayer liquid nitrogen discharge space) of the tank body 4. The pressure of the compressed air system is about 20 MPa. Under the condition of the compressed air accompanying pressure, the liquid nitrogen reaches the semi-closed space 9, with a certain jet flow orientation. The surface interlayer space of the tank body 4 is filled and rapidly cooled to -65 - 125 degrees Celsius, ensuring that the temperature around the tank body 4 drops suddenly, cutting off the combustion conditions, quickly cooling the tank body 4 to extinguish the instantaneous combustion conditions of oil products and flammable products, and ensuring that due to the increase in combustion temperature and fusion expansion, a violent explosion does not occur. Liquid nitrogen at about -100 degrees Celsius can also react with the water in the air to form a local frozen seal for the fuel leakage point.

[0042] As a specific implementation manner of the liquid nitrogen intelligent fire prevention and extinguishing device for a transport vehicle of inflammable and explosive dangerous goods provided by the present invention, please refer to Figures 1 to 4 , the detection mechanism 1 includes a pressure sensor 11, a temperature sensor 12, and an instrument automatic control box 13; the pressure sensor 11 is arranged at the front end and the rear end of the tank body 4 for detecting the impact pressure acting on the tank body 4; there are multiple temperature sensors 12 evenly arranged on the upper end of the tank body 4 for detecting the temperature of the tank body 4; the instrument automatic control box 13 is internally provided with a DC lithium battery power supply, a PLC data acquisition and execution control system, which are electrically connected to the pressure sensor 11 and the temperature sensor 12 respectively, for receiving the signals of the pressure sensor 11 and the temperature sensor 12. The limited range of the punching pressure received by the tank body 4 and the preset temperature of the tank body 4 can be set on the execution control system, and the execution control system can control the operation of the liquid nitrogen mechanism 2.

[0043] Specifically, the execution control system is a PLC controller, which can control the operation of each execution component, and can also preset the limit range or parameters on the execution control system, and can realize the automatic control operation of each execution component. It is convenient to protect the tank body 4 in the first time after an accident occurs.

[0044] As a specific implementation manner of the liquid nitrogen intelligent fire prevention and extinguishing device for a transport vehicle of inflammable and explosive dangerous goods provided by the present invention, please refer to Figures 1 to 4, the liquid nitrogen mechanism 2 includes a frame body 21 (detachably connected with an armor 27), a liquid nitrogen storage tank 22, a liquid nitrogen control valve 23, a compressed air solenoid valve 24, and a mixed gas delivery assembly 25; the frame body 21 is arranged on a transport vehicle and is located around the tank body 4 for fixing and accommodating the buffer tank body 4; the liquid nitrogen storage tank 22 stores liquid nitrogen and is arranged on the top of the frame body 21; the liquid nitrogen control valve 23 is arranged on the liquid nitrogen output conduit 26 of the liquid nitrogen storage tank 22, is connected with the instrument automatic control box 13 and is controlled by the instrument automatic control box 13. The liquid nitrogen output conduit 26 is also connected in parallel with a compressed air system. The compressed air self-equipped by the original vehicle is used as a pusher to assist the liquid nitrogen delivery, and can push the liquid nitrogen to each area of the tank body. After the liquid nitrogen control valve 23 is opened, the liquid nitrogen in the liquid nitrogen storage tank 22 is output to the liquid nitrogen output conduit 26, and the liquid nitrogen itself pressure and the output air pressure of the compressed air system are balanced to deliver to each area of the tank body 4; the compressed air solenoid valve 24 is arranged between the compressed air system and the liquid nitrogen output conduit 26 for opening control and assisting the accompanying compressed air system to deliver to the liquid nitrogen output conduit 26; one end of the mixed gas delivery assembly 25 is communicated with the outlet of the liquid nitrogen output conduit 26, and the other end is a free end and is located between the single layer of the tank body 4 and the heat insulation layer for delivering a liquid nitrogen gas flow into the semi-closed space 9 (interlayer liquid nitrogen discharge space). The frame body 21 can be a frame body, and the outer armor is detachably connected with the frame body 21. The frame body 21 is detachably connected with an armor 27, and the armor 27 is arranged on the transport vehicle.

[0045] The liquid nitrogen storage tank 22 is a special liquid nitrogen container for storing liquid nitrogen and for regular inspection. The liquid nitrogen control valve 23 is a liquid nitrogen automatic control valve and can achieve automatic control.

[0046] As a specific implementation manner of the liquid nitrogen intelligent fire prevention and extinguishing device for an inflammable and explosive dangerous goods transport vehicle provided by the present invention, please refer to Figures 1 to 4 , the mixed gas delivery assembly 25 includes a main pipeline 251 and a plurality of nozzles 252. One end of the main pipeline 251 is communicated with the liquid nitrogen outlet of the liquid nitrogen output conduit 26, and the other end is closed for guiding and transmitting liquid nitrogen. The length direction of the main pipeline 251 is parallel to the length direction of the tank body 4; there are a plurality of nozzles 252, which are evenly arranged on the lower end surface of the main pipeline 251 and are evenly arranged along the length direction of the tank body 4. A plurality of nozzles 252 are all communicated with the main pipeline 251, and the liquid nitrogen in the main pipeline 251 is sprayed into the closed space 9 (interlayer liquid nitrogen discharge space) through the plurality of nozzles 252.

[0047] As a specific implementation manner of the liquid nitrogen intelligent fire prevention and extinguishing device for an inflammable and explosive dangerous goods transport vehicle provided by the present invention, please refer to Figures 1 to 4The anti-collision buffer mechanism 3 includes a front inertia pressure buffer mechanism 31 and a rear inertia pressure buffer mechanism 32. The front inertia pressure buffer mechanism 31 is arranged at the middle of the front end surface of the tank body 4 to buffer the pressure of the front and rear inertia external forces acting on the tank body 4; the rear inertia pressure buffer mechanism 32 is arranged at the middle of the rear end surface of the tank body 4 to buffer the pressure of the front and rear inertia external forces acting on the tank body 4. The front inertia pressure buffer mechanism 31 and the rear inertia pressure buffer mechanism 32 have the same structure, and are equipped with anti-collision spring components to play a role in buffering and shock absorption.

[0048] Specifically, the front and rear inertial external forces refer to the impact forces at the front and rear ends of the tank body 4 , and both the front inertial pressure buffer mechanism 31 and the rear inertial pressure buffer mechanism 32 can play a buffering role.

[0049] As a specific embodiment of the liquid nitrogen intelligent fire prevention and extinguishing device for inflammable and explosive dangerous goods transport vehicles provided by the present invention, please refer to Figures 1 to 4 The tank body 4 can slide in a short distance along the length direction of the transport vehicle with the help of external force (impact force acting on the tank body 4 from the outside), and the anti-collision buffer mechanism 3 also includes a front steel spring 33 in the base track and a rear steel spring 34 in the base track; one end of the front steel spring 33 in the base track is arranged at the bottom of the front end of the tank body 4, and the other end is connected to the front end of the transport vehicle frame (front steel rail foundation), which is used to buffer the pressure acting on the front end of the tank body 4; one end of the rear steel spring 34 in the base track is arranged at the bottom of the rear end of the tank body 4, and the other end is connected to the rear end of the transport vehicle frame (rear steel rail foundation), which is used to buffer the pressure acting on the rear end of the tank body 4. The front steel spring 33 in the base track and the rear steel spring 34 in the base track have the same structure, and are equipped with anti-collision spring parts, which play a role in buffering and shock absorption.

[0050] Under the premise of ensuring normal transportation stability, when the tank body 4 is subjected to an accident external force that exceeds the conventional preset insurance coefficient by several times, the tank body 4 can slide under stress along the front and rear directions of the transport vehicle, and the anti-collision buffer mechanism 3 also includes a front steel spring 33 in the basic track and a rear steel spring 34 in the basic track; one end of the front steel spring 33 in the basic track is arranged in a steel spring box tube at the bottom of the front end foundation of the tank body 4, and the steel spring box tube is fixed to the main body frame of the transport vehicle, which is used to buffer the pressure of the inertial external force acting on the front end of the tank body 4 after the front end collision; one end of the rear steel spring 34 in the basic track is arranged in a steel spring box tube at the bottom of the tank body foundation at the rear end of the tank body 4, and the steel spring box tube is fixed to the main body frame, which is used to buffer the inertial external force after the rear collision, so that the tank body 4 can avoid large-scale leakage caused by perforation or tearing of the tank body due to direct stress.

[0051] After the tank body 4 is subjected to the maximum external force of the original foundation insurance, it can be moved on the track in a small range along the length direction of the front and rear vehicles by the front and rear end stress steel spring buffer.

[0052] The small distance means that after the tank body 4 is impacted, it can slide within a small distance along the length direction of the transport vehicle, which also plays a role in buffering the impact force on the tank body 4. This small distance refers to a certain short distance, generally less than 0.5 meters.

[0053] Preferably, one end of the front steel spring 33 in the basic track is arranged in the steel spring tube at the bottom of the front end of the tank body 4, and the other end is connected to the basic track groove of the tank body 4; one end of the rear steel spring 34 in the basic track is arranged in the steel spring tube at the bottom of the rear end of the tank body 4, and the other end is connected to the basic track groove of the tank body 4.

[0054] As a specific embodiment of the intelligent liquid nitrogen fire prevention and extinguishing device for transport vehicles of inflammable and explosive dangerous goods provided by the present invention, please refer to Figures 1 to 4 , a basic track 5 of the tank body 4 is fixedly arranged on the transport vehicle frame. The track 5 is arranged along the front and rear length direction of the tank body 4. A slider 6 for sliding connection with the track 5 is arranged at the bottom end of the tank body 4. The track 5 is fixed on the vehicle frame through a locking member 7. The slider 6 is fixed at the bottom end of the tank body 4 through the locking member 7. An anti-disengagement component is arranged on the track 5, and the anti-disengagement component is used to prevent the base of the tank body 4 from moving and slipping off the track 5. The track 5 is a track for installing the bottom of the basic part of the transport vehicle tank body 4 and is made of a hard asbestos product insulation and anti-spark material. The track 5 is an anti-spark track 5.

[0055] The track is a special load-bearing track, the slider is made of safe and high-temperature-resistant quartz material, and the anti-disengagement component plays a role in safe fixation to ensure safe driving within the normal limit. When the external impact exceeds the limit pressure range, the anti-disengagement component disengages from the tank body 4 and the track 5, and the tank body 4 slides back and forth a small distance along the track 5 by jacking the steel spring in the cylinder to buffer the inertial pressure. The track 5 is made of high-temperature-resistant quartz material.

[0056] A preset stress insurance bolt is provided at the bottom end basic support of the tank body 4 and is in a preset state with the track 5. The track 5 is fixed on the vehicle frame through a locking member 7. The base of the tank body 4 is restricted in the anti-disengagement track 5 through the concave and convex grooves and is fixed at the bottom end of the tank body 4 through the locking member 7. An anti-disengagement component is arranged on the track 5, and the anti-disengagement component is used to prevent the tank body 4 from slipping off the track 5. When the anti-disengagement component is subjected to an ultimate impact exceeding the preset stress for ensuring driving stability, the base of the tank body 4 can slide in the forward and reverse directions on the track 5, and the impact force is buffered, released, and decomposed by the front and rear bases and the stress steel springs in the middle of the front and rear tank bodies 4.

[0057] Specifically, the track 5 is made of high-temperature-resistant quartz material, allowing the slider 6 or the tank body 4 to slide a certain distance on the slideway. This distance is limited. Beyond this range, the movement of the tank body 4 will be restricted. Only by setting it like this can it be ensured that the tank body 4 slides on the track 5 and buffers the pressure acting on the tank body 4 during the sliding.

[0058] As a specific embodiment of the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles provided by the present invention, please refer to Figures 1 to 4 , the anti-collision buffer mechanism 3 further includes a frame-type support column buffer assembly 35. There are multiple frame-type support column buffer assemblies 35, which are independent arc-shaped buffer frame types. They are all arranged circumferentially along the outer wall of the tank body 4 in the closed space 9 (interlayer liquid nitrogen discharge space). The bottom end is connected to the single-layer outer wall of the tank body 4 through a steel spring wrapped with buffer rubber, and the top end is connected to the inner wall of the thermal insulation layer. It provides support for the pipelines of the liquid nitrogen mechanism, maintains the buffer distance for the thermal insulation layer to bear external forces, and is used to buffer the pressures in different directions acting on the thermal insulation layer.

[0059] The frame-type support column buffer assembly 35 is a multiple-arc frame-type protection body with buffer devices. The bottom end is connected to the force-bearing keel structure of the tank body 4 as an anti-collision buffer support point, and is suspended and fixedly connected through a buffer device with a specially wrapped rubber steel spring. At the same time, the structure also provides support for the fixed installation of the injection pipelines of the liquid nitrogen mechanism 2, ensuring that there is a certain transmission space distance for the liquid nitrogen gas inside the tank body 4, and is used to fix the outermost removable heat insulation armor, so that the internal space and the outer removable armor have a certain internal bearing pressure.

[0060] The rubber-wrapped steel spring can prevent collision and ignition with rubber material, avoiding the generation of fire sources. The frame-type support column buffer assembly 35 provides support for the pipelines of the liquid nitrogen mechanism to prevent the pipelines from being flattened. The pressures in different directions acting on the tank body 4 refer to the impact forces in different directions on the tank body 4.

[0061] For collisions, fishtailing, twisting of the vehicle from different directions, generally without rolling over, by setting multiple frame-type support column buffer assemblies 35, the left and right impact and twisting forces can be instantaneously buffered at the waist, which can play a role in protecting the tank body 4, preventing the leakage of the tank body 4, and playing a role in shock absorption.

[0062] The frame-type support column buffer assembly 35 is internally provided with a steel spring, which mainly plays an auxiliary role in fixing the tank body 4. For large-amplitude left and right swings of a certain intensity, the basic support arm can buffer and suppress the centrifugal force of the tank body 4, reduce the large-amplitude left and right swings generated during vehicle collisions, and reduce the probability of tipping over.

[0063] As a specific embodiment of the intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles provided by the present invention, please refer to Figures 1 to 4 , an anti-collision steel cross beam 8 is fixedly arranged on the vehicle body structure skirt around the transport vehicle. The tank body 4 is placed inside the protection frame surrounded by the anti-collision steel cross beam 8. The anti-collision steel cross beam 8 and the tank body 4 are supported and suspendedly connected through a plurality of protection buffer assemblies 10 arranged therebetween. The protection buffer assemblies 10 are used to buffer the pressure acting on the tank body 4. The front steel spring 33 in the basic track and the rear steel spring 34 in the basic track can be connected to the anti-collision steel cross beam 8. The supported suspension means providing support for the protection buffer assembly 10 and supporting a certain height.

[0064] There is a certain distance between the anti-collision steel cross beam 8 and the tank body 4. Through the hollow energy-absorbing aluminum alloy body on the side periphery, the protection and buffer assembly 10 is a buffer device for buffering the impact force from the rear, left and right sides.

[0065] The intelligent liquid nitrogen fire prevention and extinguishing device for transport vehicles of inflammable and explosive dangerous goods is also applicable to the software and hardware use of different media such as vehicle-mounted carbon dioxide fire extinguishing and vehicle-mounted dry powder fire extinguishing, such as automatic detection, automatic actuators, and supporting injection fluid pipelines.

[0066] Specifically, the anti-collision steel cross beam 8 is internally provided with large-gap steel springs, and the overall structure of the hollow honeycomb steel plate has an energy-absorbing effect on direct collisions. The protection and buffer assembly 10 includes a horizontally arranged spring member and a vertically arranged spring member, which can play a role in buffering the tank body 4 in the horizontal direction and also in the vertical direction.

[0067] The above-mentioned outer armor can be understood as the armor 27.

[0068] The present invention also provides a transport vehicle, which includes a vehicle body for transporting inflammable and explosive dangerous goods, and also includes an intelligent liquid nitrogen fire prevention and extinguishing device for transport vehicles of inflammable and explosive dangerous goods provided on the vehicle body.

[0069] The transport vehicle provided by the present invention adopts the above-mentioned intelligent liquid nitrogen fire prevention and extinguishing device for transport vehicles of inflammable and explosive dangerous goods, and is also applicable to the software and hardware equipment, automatic detection operating system, and pipeline transportation method of inflammable and explosive dangerous goods. The equipment principle can also be matched with the application of carbon dioxide medium, dry powder and other fire extinguishing media. When a vehicle collision or other accidents occur, it can protect the tank body 4 in the first time, prevent leakage, and minimize the losses caused by combustion and explosion, and ensure the safety of the surrounding environment and other life and property of the transport vehicle.

[0070] Generally, a total monitoring instrument panel, a real-time transmission monitor for vehicle-mounted satellite positioning of dangerous goods, a radio frequency analysis front and rear ranging warning device are equipped on the transport vehicle, and there are also a liquid nitrogen storage guarantee device, a lithium battery pack power supply, a tank body 4 relief and maintenance valve, a liquid nitrogen wave attenuation curved partition board and a liquid nitrogen inventory electronic pressure sensor.

[0071] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. Intelligent fire prevention and extinguishing device for liquid nitrogen in transport vehicles of inflammable and explosive dangerous goods, characterized in that include: The detection mechanism is arranged at the front and rear ends of the tank for containing inflammable and explosive dangerous goods, and is used to detect the impact pressure exerted on the tank by the outside world and the temperature of the tank. The detection mechanism can preset the limited range of the impact pressure on the tank and the preset tank temperature; A liquid nitrogen mechanism is provided at the upper end of the tank body and is connected to the detection mechanism. The liquid nitrogen mechanism is connected in parallel to a compressed air system provided on a transport vehicle for transporting the tank body. The liquid nitrogen in the liquid nitrogen mechanism is pushed onto the tank body by the air pressure of the compressed air system and enters the semi-enclosed space between the single layer of the tank body and the outer armor. Then, the liquid nitrogen forms an ice gas layer to surround the single layer of the tank body and realize self-rescue, change the temperature of the tank body in a short time, and block the explosion conditions formed by the high-temperature expansion of combustion. The operation of the liquid nitrogen mechanism is controlled by the detection mechanism. When the tank body temperature and the impact pressure detected by the detection mechanism are within a limited range, the detection mechanism commands the liquid nitrogen mechanism to operate; as well as The anti-collision buffer mechanism is installed on the transport vehicle or the tank body to protect the tank body from collision during transportation and to buffer the distortion force and inertia force acting on the tank body; The detection mechanism includes: Pressure sensors are located at the front and rear ends of the tank body to detect the impact pressure acting on the tank body; A plurality of temperature sensors are arranged on the upper end of the tank body to detect the temperature of the tank body; and An instrument automatic control box, with a built-in direct current lithium power supply, a PLC data collection and execution control system, which is electrically connected to the pressure sensor and the temperature sensor respectively, and is used to receive signals from the pressure sensor and the temperature sensor. The limited range of the stamping pressure on the tank body and the preset tank body temperature can be set on the execution control system, and the execution control system can control the operation of the liquid nitrogen mechanism; The liquid nitrogen mechanism comprises: A frame body is installed on the transport vehicle and is located around the tank body, and is used to fix and wrap the tank body; Liquid nitrogen storage tank, which stores liquid nitrogen, is located on the top of the frame; The liquid nitrogen control valve is arranged on the liquid nitrogen output conduit of the liquid nitrogen storage tank, connected to and controlled by the instrument automatic control box, and the liquid nitrogen output conduit is also connected in parallel to the compressed air system. The original vehicle-mounted self-provided compressed air is used as a push-assisted liquid nitrogen transport, and the liquid nitrogen can be pushed to various parts of the tank body. After the liquid nitrogen control valve is opened, the liquid nitrogen in the liquid nitrogen storage tank is output to the liquid nitrogen output conduit, and the pressure of the liquid nitrogen itself is balanced and transported to various areas of the tank body with the help of the compressed air system output air pressure; A compressed air solenoid valve, disposed between the compressed air system and the liquid nitrogen output conduit, for opening and controlling and assisting the compressed air system in conveying the liquid nitrogen to the liquid nitrogen output conduit; and A mixed gas delivery assembly, one end of which is connected to the outlet of the liquid nitrogen output conduit, and the other end of which is a free end and is located between the tank body single layer and the insulation layer, and is used to deliver liquid nitrogen gas flow into the semi-enclosed space; The anti-collision buffer mechanism comprises: A front inertia pressure buffer mechanism is provided at the middle of the front end surface of the tank body and is used to buffer the pressure acting on the front end of the tank body; and The rear inertia pressure buffer mechanism is arranged in the middle of the rear end surface of the tank body and is used to buffer the pressure acting on the rear end of the tank body; The transport vehicle frame is fixedly provided with tracks, which are arranged along the front-back length direction of the tank body. The bottom end of the tank body is provided with sliders for slidingly connecting with the tracks. The tracks are fixed on the frame by locking members, and the sliders are fixed to the bottom end of the tank body by locking members. An anti-disengagement assembly is provided on the tracks, and the anti-disengagement assembly is used to prevent the tank body from slipping off the tracks.

2. The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles according to claim 1, wherein The mixed gas delivery assembly includes: A main pipeline, one end of which is communicated with the liquid nitrogen outlet of the liquid nitrogen output conduit and the other end of which is closed, for transporting liquid nitrogen. The length direction of the main pipeline is parallel to the length direction of the tank body; and Nozzles, which are multiple and are evenly distributed on the lower end surface of the main pipeline along the length direction of the tank body. The multiple nozzles are all communicated with the main pipeline, and the liquid nitrogen in the main pipeline is sprayed into the enclosed space through the multiple nozzles.

3. The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles according to claim 1, characterized in that, The tank body can slide within a small range along the length direction of the transport vehicle by means of external force. The anti-collision buffer mechanism further includes: A front steel spring in the basic track, one end of which is arranged at the bottom of the front end of the tank body and the other end of which is connected to the front end of the transport vehicle frame, for buffering the pressure exerted on the tank body by the front-back inertial external force; and A rear steel spring in the basic track, one end of which is arranged at the bottom of the rear end of the tank body and the other end of which is connected to the rear end of the transport vehicle frame, for buffering the pressure exerted on the tank body by the front-back inertial external force.

4. The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles according to claim 1, wherein The anti-collision buffer mechanism further includes: Frame-type support column buffer assemblies, which are multiple and are independent arc-shaped buffer frames. They are all arranged circumferentially along the tank body in the enclosed space. The bottom ends are connected to the single-layer outer wall of the tank body by steel springs wrapped with buffer rubber, and the top ends are connected to the inner wall of the heat insulation layer, providing support for the pipelines of the liquid nitrogen mechanism, maintaining the buffer distance for the heat insulation layer to bear external forces, and being used to buffer the pressure in different directions acting on the heat insulation layer.

5. The intelligent liquid nitrogen fire prevention and extinguishing device for inflammable and explosive dangerous goods transportation vehicles according to claim 1, wherein An anti-collision steel cross beam is fixedly provided on the transport vehicle and is fixed to the vehicle body structure skirt. The tank body is placed inside the protection frame surrounded by the anti-collision steel cross beam. The anti-collision steel cross beam and the tank body are supported and suspendedly connected through a plurality of protection buffer assemblies arranged therebetween, and the protection buffer assemblies are used to buffer the pressure acting on the tank body.

6. A transport vehicle, comprising a vehicle body for transporting inflammable and explosive dangerous goods, characterized in that, It further includes a liquid nitrogen intelligent fire prevention and extinguishing device for an inflammable and explosive dangerous goods transport vehicle as described in any one of claims 1-5 provided on the vehicle body.

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